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PAUL KUHN E, OF BIRMINGHAM, ALABAMA.

REINFoncnvG-BAR.

Specification of Letters Patent.

Patented July 29, 1919.

Application led October 1, 1918. Serial No. 256,413.

To all whom t may concern:

Be it known that I, PAUL Knr-INE, a citi- Zen of the United States,residing at 2520 15th avenue, South, Birmingham, in the county ofJefferson and State of Alabama, have invented certain new and usefulImprovements in Reinforcing-Bars, of which the following is aspecication.

This invention relates to improvements in reinforcing bars.

The prime object of the invention is to provide a reinforced bar soproportioned and constructed as to eifectually distribute the tensionthroughout the structure when 1n use.

A further object of the invention is to provide a reinforcing bar with around body portion, and distributed on the periphery thereof a pluralityof longitudinal projections so disposed and proportioned 1n section andlength to the diameter of the bar that every ounce of steel is intension when the bar is in use.

The invention also comprehends improve- `ments in the details ofconstruction and arrangement of the specific parts, which will behereinafter described and particularly pointed out in the claim.

In the drawings Figure 1 is a detail perspective view of a portion of myimproved bar.

Fig. 2 is a cross section on the line 2-2 of Fig. 1.

Fig. 3 is a cross section on the line 3--3 of Fig. 1.

1 indicates a bar.- The main body portion 2, thereof is cylindrical incross section. On the periphery of the cylindrical portion 2, arepreferably two sets of longitu inal projections 3 and 4. The sets ofprojections 3, are each spaced apart at 5, and each projection issemi-circular in cross section. The sets of projections 4: are spacedapart, as at 6, and are in every respect the same as the sets ofprojections 3, except that the projections 4 are disposed inlongitudinal alinement with the spaces 5 between said sets ofprojections 3. The result of this arrangement is the formation of aplurality of alternately disposed longitudinal projections on theperiphery of the bar, the amount of metal being such as to equalize thecross sectional proportions in such manner that tension is distributedthroughout the whole structure when the bar is 1n use.

When the bar is embedded in concrete, the latter becomes pocketedbetween the projections, and a plurality of concrete ribs or projectionsare produced between the projections on the bar, hence the bar isprevented from rotary or lateral movement. Because of the formation ofthe concrete ribs or projections bein disposed in alternate longitudinalorder gbetween the respective sets of projections on the bar,longitudinal movement of the bar is absolutely impossible. It thereforefollows that when a bar such as described is embedded in a body ofconcrete, the bar and concrete become fixed with relation to each other,and thactl the tension of the bar is equally distribute What I claim isA reinforcing bar comprising a cylindrical body portion provided on itsperiphery with spaced apart longitudinal projections, each projectionbeing semi-circular in cross section and flat at its ends, eachsucceeding set of projections terminating in circumferential alinementwith the beginning of the adjacent projections, and the projections ofone set being disposed in line with the spaces between the projectionsof the adjacent set.

In testimony whereof I aiiix my signature.

PAUL KUHNE.

(topics of thispatent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

